<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
	<title>块状按钮</title>
	<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
</head>
<body>
    <button class="btn btn-primary btn-lg btn-block" type="button">大型按钮.btn-lg</button> 
    <button class="btn btn-primary btn-block" type="button">正常按钮</button>
    <button class="btn btn-primary btn-sm btn-block" type="button">小型按钮.btn-sm</button>
    <button class="btn btn-primary btn-xs btn-block" type="button">超小型按钮.btn-xs</button>   
</body>
</html>